某核废物填埋区土壤对Sr吸附的动态模拟实验研究

DYNAMIC SIMULATION EXPERIMENT RESEARCH ON STRONTIUM ADSORPTION IN SOIL OF A DISPOSAL FACTORY OF VERY-LOW-LEVEL WASTE

目前，我国处理极低放废物采用的是就近地质填埋的方法，通过选择合适的吸附材料及添加剂，建立人工屏障，以最大限度地阻滞核素进入与人类生活有关的自然环境中。这里通过研究某地土壤对Sr的吸附，做了动态模拟试验，建立了动态模型，进行不同高度柱体的对比实验。经实验表明：填埋区土壤TY29＋1％人造沸石作为填埋场屏障材料，可营造“碱性～还原”氛围，对阻滞Sr迁移非常有效。不同高度柱体对比实验表明：当柱高度之比为1：2：3，C／C0=0．5时，其累计输出的流量之比为1：1．96：2．16，平均渗透系数分别为：0．62、0．52、0．54。由此可见，随高度增加，吸附性能呈增高的趋势，且柱体渗透性降低。在柱体吸附一段时间后，三个柱的吸附能力都出现了减小的突越，这与在吸附过程中前期为物理吸附进行的较快，后期为化学吸附进行的较慢有关。

Nowadays to dispose the very low-level-waste,we usually adopt geologic fill-in method near the radio waste,and usually build man-made barriers by choosing feat adsorption material and addictive to block the nuclide entering the human live environment in furthest.The authors do some research on adsorption of Strontium,do dynamic experiment and build models in different heights to contrast.The results show that sample TY29 append man-made zeolite as barrier material of disposal factory can build alkalescent and deoxidized atmosphere and be good for block Strontium.Different heights comparing experiment shows that when the heights ratio is 1 ∶2 ∶3,and C/C 0=0.5,the ratio of added up output runoff is 1 ∶1.96 ∶2.16,and the average penetrate coefficient are 0.62,0.52,0.54.So the capability of absorption is heighten as the height is added,and the penetrability is fall.After several hours,the capability of adsorption of the three poles are decreased suddenly,and it's probably caused by its physics adsorption and going on fast in the first phase but later chemical adsorption and going on slow.